Only MacOS X/10 is supported - earlier versions have no Unicode (language) support...

TrueType:

Recommended for"office" or "home" use

TrueType is the format invented by Apple and Microsoft for their operating systems, so for everyday use this is the format of choice.Select if you primarily work in Microsoft Office programs like Word, PowerPoint, Excel - or similar.

OpenType:

Recommended for"graphic design" use

OpenType is the new format made by Adobe and Microsoft - it is based on TrueType technology, but contains Postscript outlines.Select if you primarily work in graphic design programs like Adobe CSs InDesign, PhotoShop or Illustrator - or Quark7.

Postscript:

Not recommended!(and not supplied ;)

The original font format, but not very easy to work with when using foreign languages - because it does not support Unicode text encoding.Use newer programs and OpenType instead.